| Issue | 134258 |
|---|---|
| Summary | CMake Config files don't provide deprecated Module variables |
| Labels | new issue |
| Assignees | |
| Reporter | bebuch |
I try to build LLVM with zlib-ng (in compatability mode), zstd and libxml2. I have build these projects an installed there config files. I use a custom include install path. Therefor the outdated CMake Modules can't work for my build.
The modern project Config files do not provide `ZLIB_INCLUDE_DIR`, `ZLIB_LIBRARY`, `zstd_INCLUDE_DIR`, `zstd_LIBRARY`, `LIBXML2_LIBRARY` and `LIBXML2_INCLUDE_DIR`. LLVM CMake code depends on these variables. It also uses the targets which are produced by the Modules and the Config files. ZLIB is broken right at the start: https://github.com/llvm/llvm-project/blob/61ef28650626dd4f651a250005c77255d8086f69/llvm/cmake/config-ix.cmake#L165-L186 Only the check depends on the old variables, so it works if you remove it. The next problematic section seams to be: https://github.com/llvm/llvm-project/blob/2334fd2ea3a0a391ca88da36764d895d9c34e1bc/llvm/cmake/modules/LLVMExternalProjectUtils.cmake#L172-L196 I think the variables are here passed to a subsequent call. This might be the reason for these errors in my build run: ```none loading initial cache file C:/TechnoTeam/develop/usr/build/llvm/projects/runtimes/tmp/runtimes-cache-Release.cmake -- Performing bootstrapping runtimes build. -- Could NOT find ZLIB (missing: ZLIB_INCLUDE_DIR) -- Could NOT find zstd (missing: zstd_INCLUDE_DIR) -- Could NOT find LibXml2 (missing: LIBXML2_INCLUDE_DIR) -- Could NOT find ZLIB (missing: ZLIB_INCLUDE_DIR) -- Could NOT find zstd (missing: zstd_INCLUDE_DIR) -- Could NOT find LibXml2 (missing: LIBXML2_INCLUDE_DIR) CMake Error at C:/temp/tt/env/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:233 (message): Could NOT find Python3 (missing: Python3_EXECUTABLE Interpreter) Call Stack (most recent call first): C:/temp/tt/env/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:603 (_FPHSA_FAILURE_MESSAGE) C:/temp/tt/env/share/cmake-3.31/Modules/FindPython/Support.cmake:4002 (find_package_handle_standard_args) C:/temp/tt/env/share/cmake-3.31/Modules/FindPython3.cmake:602 (include) CMakeLists.txt:180 (find_package) ``` I'm not sure whats the best way to fix this. On simple way might be to create the variables from the targets if they don't exist after the `find_package`.
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